How to enable UART3(ttymxc2) and UART4(ttymxc3)?

[kkd1]

How to enable UART3 and UART4 in iwave imx6qdl pico SBC board?

The device is linux-iwave/arch/arm/boot/dts/imx6dls-iwg15s-pico.dtsi

is any additional settings to enable this ttymxc2(UART3_RXD(EIM_D25))  and ttymxc3(UART4_RXD(KEY_ROW0)) ??

Thank you

#imx-6q‌ #custom linux

[Avi1]

How to test the loop back for UART2 using ttymxc2 for the mira-imx6-15 in the expansion header ? What are the pins for that ?

[igorpadykov]

Hi kk

please look at i.mx6q sabre ai board example (imx6qdl-sabreauto.dtsi) which uses uart3

linux-imx.git - i.MX Linux Kernel 

check in uboot/include/configs/mx6qsabreauto.h for :

#define CONFIG_MXC_UART_BASE    UART4_BASE
#define CONSOLE_DEV        "ttymxc3"

Best regards
igor
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[kkd1]

Hi igorpadykov,

Thanks for reply.

I tried with suggested changes, but UART3 is not transmitting or receiving any data.

[Hardware pins are UART3_RXD (EIM_D25) and UART3_TXD(EIM_D24).

no rts cts pins.]

Please guide.

Thank you

[igorpadykov]

Hi kk

one can attach jtag debugger and check uart clocks

in CCM_CCGRn registers and pin iomux settings using

IOMUXC chapter Reference Manual.

Best regards
igor